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i like easy questions !
it is pretty easy right? use pythangoras to get the missing side

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\[y^2+84^2=85^2\] solve for \(y\)
you good from there or you need steps?
So what do I do with the number? Do I add them, subtract them or divide?
order of operations
ok lets take the steps
you have one number on one side of the equals side what do you do to get them on the other?
you can do the arithmetic at any time first, last, whatever lets do it first
\[y^2+84^2=85^2\]square each (i used a calculator) to get \[y^2+7056=7225\]
now two steps to find \(y\) first subtract \(7056\) from both sides \[y^2=7225-7056\\ y^2=169\]
then take the square root of \(169\) to find \(y\)\[y=\sqrt{169}=13\]
if you have to do a lot of these, there is another way you might get used to
go right to \[y=\sqrt{85^2-84^2}\] and plug that (carefully) in to a calculator i use this http://www.wolframalpha.com/input/?i=sqrt%2885^2-84^2%29

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